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Gastric bypass surgery : This surgery alters the digestive system, reducing the bodys ability to absorb B12 from food and supplements.For these individuals, methylcobalamin B12 injections provide a direct way to bypass the digestive system and restore essential B12 levels

Curr Protoc Cell Biol 79, e51

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You probably know carrots, which are very high in beta carotene, are good for poor vision

Is the GHK-Cu half life different in different tissues